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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Qwt User's Guide: QwtPlotCanvas Class Reference</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.6 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li id="current"><a href="classes.html"><span>Classes</span></a></li> <li><a href="files.html"><span>Files</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="classes.html"><span>Alphabetical List</span></a></li> <li><a href="annotated.html"><span>Class List</span></a></li> <li><a href="hierarchy.html"><span>Class Hierarchy</span></a></li> <li><a href="functions.html"><span>Class Members</span></a></li> </ul></div><h1>QwtPlotCanvas Class Reference</h1><!-- doxytag: class="QwtPlotCanvas" --><a href="class_qwt_plot_canvas-members.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>Canvas of a <a class="el" href="class_qwt_plot.html">QwtPlot</a>. <p><dl compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_plot.html">QwtPlot</a> </dd></dl><p><p>Definition at line <a class="el" href="qwt__plot__canvas_8h-source.html#l00028">28</a> of file <a class="el" href="qwt__plot__canvas_8h-source.html">qwt_plot_canvas.h</a>.<table border="0" cellpadding="0" cellspacing="0"><tr><td></td></tr><tr><td colspan="2"><br><h2>Public Types</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#76066290edb594a71ee09be564563b0f">PaintAttribute</a> { <br> <b>PaintCached</b> = 1, <br> <b>PaintPacked</b> = 2<br> }</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#89b44e4c28038a674ce211fe9ac2d7be">FocusIndicator</a> { <br> <b>NoFocusIndicator</b>, <br> <b>CanvasFocusIndicator</b>, <br> <b>ItemFocusIndicator</b><br> }</td></tr><tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#e7330616dbb97128d01c5446ef0b006e">setFocusIndicator</a> (<a class="el" href="class_qwt_plot_canvas.html#89b44e4c28038a674ce211fe9ac2d7be">FocusIndicator</a>)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="class_qwt_plot_canvas.html#89b44e4c28038a674ce211fe9ac2d7be">FocusIndicator</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#0e9653bdf8c62299dbc3551ac7e5ec51">focusIndicator</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#7859beb87bcef4fd53f99e7c87104e27">setPaintAttribute</a> (<a class="el" href="class_qwt_plot_canvas.html#76066290edb594a71ee09be564563b0f">PaintAttribute</a>, bool on=true)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#804f78518b0ba72b11ba996fd2457fb1">testPaintAttribute</a> (<a class="el" href="class_qwt_plot_canvas.html#76066290edb594a71ee09be564563b0f">PaintAttribute</a>) const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">QPixmap * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#9181564270ad961288f6651dcd08ad15">paintCache</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">const QPixmap * </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#1f5bfe56b2c65bdb956cc0a9d805d1ae">paintCache</a> () const </td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#d03018bfc24f361e4ba359643c5c23b6">invalidatePaintCache</a> ()</td></tr><tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#e708ed2bc2fe614a809b9b70c9e8959e">QwtPlotCanvas</a> (<a class="el" href="class_qwt_plot.html">QwtPlot</a> *)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#320320bbb1b511c0c37fb2452a7f4404">~QwtPlotCanvas</a> ()</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="97e862e6c27fd0f88c5eccc5e4e64096"></a><!-- doxytag: member="QwtPlotCanvas::hideEvent" ref="97e862e6c27fd0f88c5eccc5e4e64096" args="(QHideEvent *)" -->virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#97e862e6c27fd0f88c5eccc5e4e64096">hideEvent</a> (QHideEvent *)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="a8f1516817c578efd407d8dd574170ec"></a><!-- doxytag: member="QwtPlotCanvas::paintEvent" ref="a8f1516817c578efd407d8dd574170ec" args="(QPaintEvent *)" -->virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#a8f1516817c578efd407d8dd574170ec">paintEvent</a> (QPaintEvent *)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#3c6e3cddf7fe4f48db64459b01a37301">drawContents</a> (QPainter *)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#4dc526ac5186fe253a158a392bbb4f40">drawFocusIndicator</a> (QPainter *)</td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#48cd4c52f0524f1a21fa53201159aa7c">drawCanvas</a> (QPainter *painter=NULL)</td></tr><tr><td colspan="2"><br><h2>Friends</h2></td></tr><tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="7aced0319c0c2bb341ed9e3be2966c46"></a><!-- doxytag: member="QwtPlotCanvas::QwtPlot" ref="7aced0319c0c2bb341ed9e3be2966c46" args="" -->class </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_plot_canvas.html#7aced0319c0c2bb341ed9e3be2966c46">QwtPlot</a></td></tr></table><hr><h2>Member Enumeration Documentation</h2><a class="anchor" name="89b44e4c28038a674ce211fe9ac2d7be"></a><!-- doxytag: member="QwtPlotCanvas::FocusIndicator" ref="89b44e4c28038a674ce211fe9ac2d7be" args="" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">enum <a class="el" href="class_qwt_plot_canvas.html#89b44e4c28038a674ce211fe9ac2d7be">QwtPlotCanvas::FocusIndicator</a> </td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Focus indicator. <p><ul><li>NoFocusIndicator<br> Don't paint a focus indicator</li></ul><p><ul><li>CanvasFocusIndicator<br> The focus is related to the complete canvas. Paint the focus indicator using paintFocus()</li></ul><p><ul><li>ItemFocusIndicator<br> The focus is related to an item (curve, point, ...) on the canvas. It is up to the application to display a focus indication using f.e. highlighting.</li></ul><p><dl compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_plot_canvas.html#e7330616dbb97128d01c5446ef0b006e">setFocusIndicator()</a>, <a class="el" href="class_qwt_plot_canvas.html#0e9653bdf8c62299dbc3551ac7e5ec51">focusIndicator()</a>, paintFocus() </dd></dl><p>Definition at line <a class="el" href="qwt__plot__canvas_8h-source.html#l00080">80</a> of file <a class="el" href="qwt__plot__canvas_8h-source.html">qwt_plot_canvas.h</a>. </td> </tr></table><a class="anchor" name="76066290edb594a71ee09be564563b0f"></a><!-- doxytag: member="QwtPlotCanvas::PaintAttribute" ref="76066290edb594a71ee09be564563b0f" args="" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">enum <a class="el" href="class_qwt_plot_canvas.html#76066290edb594a71ee09be564563b0f">QwtPlotCanvas::PaintAttribute</a> </td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Paint attributes. <p><ul><li>PaintCached<br> Paint double buffered and reuse the content of the pixmap buffer for some spontaneous repaints that happen when a plot gets unhidden, deiconified or changes the focus. Disabling the cache will improve the performance for incremental paints (using <a class="el" href="class_qwt_plot_curve.html#8d52afdd1612ccb4dbf3f410886e680b">QwtPlotCurve::draw</a>).</li></ul><p><ul><li>PaintPacked<br> Suppress system background repaints and paint it together with the canvas contents. Painting packed might avoid flickering for expensive repaints, when there is a notable gap between painting the background and the plot contents.</li></ul><p>The default setting enables PaintCached and PaintPacked<p><dl compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_plot_canvas.html#7859beb87bcef4fd53f99e7c87104e27">setPaintAttribute()</a>, <a class="el" href="class_qwt_plot_canvas.html#804f78518b0ba72b11ba996fd2457fb1">testPaintAttribute()</a>, <a class="el" href="class_qwt_plot_canvas.html#9181564270ad961288f6651dcd08ad15">paintCache()</a> </dd></dl><p>Definition at line <a class="el" href="qwt__plot__canvas_8h-source.html#l00056">56</a> of file <a class="el" href="qwt__plot__canvas_8h-source.html">qwt_plot_canvas.h</a>. </td> </tr></table><hr><h2>Constructor & Destructor Documentation</h2><a class="anchor" name="e708ed2bc2fe614a809b9b70c9e8959e"></a><!-- doxytag: member="QwtPlotCanvas::QwtPlotCanvas" ref="e708ed2bc2fe614a809b9b70c9e8959e" args="(QwtPlot *)" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">QwtPlotCanvas::QwtPlotCanvas </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top"><a class="el" href="class_qwt_plot.html">QwtPlot</a> * </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap><code> [explicit, protected]</code></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Sets a cross cursor, enables QwtPlotCanvas::PaintCached. <p><p>Definition at line <a class="el" href="qwt__plot__canvas_8cpp-source.html#l00050">50</a> of file <a class="el" href="qwt__plot__canvas_8cpp-source.html">qwt_plot_canvas.cpp</a>.<p>References <a class="el" href="qwt__plot__canvas_8cpp-source.html#l00090">setPaintAttribute()</a>. </td> </tr></table><a class="anchor" name="320320bbb1b511c0c37fb2452a7f4404"></a><!-- doxytag: member="QwtPlotCanvas::~QwtPlotCanvas" ref="320320bbb1b511c0c37fb2452a7f4404" args="()" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">QwtPlotCanvas::~QwtPlotCanvas </td> <td class="md" valign="top">( </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap><code> [protected, virtual]</code></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Destructor. <p><p>Definition at line <a class="el" href="qwt__plot__canvas_8cpp-source.html#l00075">75</a> of file <a class="el" href="qwt__plot__canvas_8cpp-source.html">qwt_plot_canvas.cpp</a>. </td> </tr></table><hr><h2>Member Function Documentation</h2><a class="anchor" name="48cd4c52f0524f1a21fa53201159aa7c"></a><!-- doxytag: member="QwtPlotCanvas::drawCanvas" ref="48cd4c52f0524f1a21fa53201159aa7c" args="(QPainter *painter=NULL)" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">void QwtPlotCanvas::drawCanvas </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">QPainter * </td> <td class="mdname1" valign="top" nowrap> <em>painter</em> = <code>NULL</code> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap><code> [protected]</code></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Draw the the canvas<p>Paints all plot items to the contentsRect(), using <a class="el" href="class_qwt_plot.html#dd1b88d8312e2671652d23f8181f2433">QwtPlot::drawCanvas</a> and updates the paint cache.<p><dl compact><dt><b>See also:</b></dt><dd><a class="el" href="class_qwt_plot.html#dd1b88d8312e2671652d23f8181f2433">QwtPlot::drawCanvas</a>, setPaintAttributes(), testPaintAttributes() </dd></dl><p>Definition at line <a class="el" href="qwt__plot__canvas_8cpp-source.html#l00251">251</a> of file <a class="el" href="qwt__plot__canvas_8cpp-source.html">qwt_plot_canvas.cpp</a>. </td> </tr></table><a class="anchor" name="3c6e3cddf7fe4f48db64459b01a37301"></a><!-- doxytag: member="QwtPlotCanvas::drawContents" ref="3c6e3cddf7fe4f48db64459b01a37301" args="(QPainter *)" --><p><table class="mdTable" cellpadding="2" cellspacing="0"> <tr> <td class="mdRow"> <table cellpadding="0" cellspacing="0" border="0"> <tr> <td class="md" nowrap valign="top">void QwtPlotCanvas::drawContents </td> <td class="md" valign="top">( </td> <td class="md" nowrap valign="top">QPainter * </td> <td class="mdname1" valign="top" nowrap> </td> <td class="md" valign="top"> ) </td> <td class="md" nowrap><code> [protected, virtual]</code></td> </tr> </table> </td> </tr></table><table cellspacing="5" cellpadding="0" border="0"> <tr> <td> </td> <td><p>Redraw the canvas, and focus rect. <p><p>Definition at line <a class="el" href="qwt__plot__canvas_8cpp-source.html#l00228">228</a> of file <a class="el" href="qwt__plot__canvas_8cpp-source.html">qwt_plot_canvas.cpp</a>.⌨️ 快捷键说明
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